Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) causes a high viscosity, which, upon rapid cooling, results in a natural glass forming from the lava.

Gems and Minerals

Deck/File Name: Obsidians (obsidians)
Made/Donated by: Aki / saya Color: Black
Released: 2020-12-05 Masterable: Yes
Wished by: saya, Eimii, rian, Frankie, Alecks
Mastered by: saya, Hotaru, Mysti, Kayori, Kupo, Mio, Lex, Aki, Kayori, erin, Eviantus, Lina, Suza, saya